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PhysicsNEET 2024First law, work and internal energy

Thermodynamics

A thermodynamic system is taken through the cycle abcdaabcda shown in the PP–VV diagram. The work done by the gas along the path bcbc is:

Question 3 as printed in the NEET 2024 booklet

  1. A.30 J
  2. B.–90 J
  3. C.–60 J
  4. D.Zero✓

Solution

Path bcbc runs vertically on the PP–VV diagram: the volume stays at 400 cm³ while the pressure rises. With ΔV=0\Delta V = 0, the work done by the gas ∫P dV\int P\,dV is zero.

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